wsp=[ 0.026748757411, ...
   -0.016864118443, ...
   -0.078223266529, ...
    0.266864118443, ...
    0.602949018236, ...
    0.266864118443, ...
   -0.078223266529, ...
   -0.016864118443, ...
    0.026748757411];

in = [zeros(1,2), 127, -128, -128, 127, 127, 127, -128, -128, 127 , zeros(1,20)];

out=filter(wsp,1,in)